Method of making high-strength, high-toughness steel with good w

Details Method of making high-strength, high-toughness steel with good w Method of making high-strength, high-toughness steel with good w

1981-03-20

1983-09-27

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 12F, 148 124, 148 36, C21D 800

Patent

active

044067135

ABSTRACT:
A high-strength, high-toughness steel with good workability is produced by working a steel containing 0.005-0.3% C and 0.3-2.5% Mn and optionally up to 1.5% Si, in the course of hot working thereof, at temperatures within the range of from the Ar.sub.3 point to 930.degree. C. or to 980.degree. C. (for a steel containing Nb, V, Ti and/or Zr) at an area reduction rate of at least 30%, and, in the course of cooling, rapidly cooling the steel in the ferrite phase precipitation temperature range when the ferrite phase has occupied 5-65% or 5-60% (for a steel with Si and/or Nb, V, Ti and/or Zr) of the steel, whereby a two-phase structure comprising ferrite and martensite is produced.

REFERENCES:
patent: 3939015 (1976-02-01), Grange
patent: 4072543 (1978-02-01), Coldren et al.
patent: 4188241 (1980-02-01), Watanabe et al.
patent: 4284438 (1981-08-01), Barwick et al.
patent: 4325751 (1982-04-01), Josefsson

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